Back to Search
Start Over
Two-Qubit Spectroscopy of Spatiotemporally Correlated Quantum Noise in Superconducting Qubits
- Source :
- PRX Quantum, Vol 1, Iss 1, p 010305 (2020)
- Publication Year :
- 2020
- Publisher :
- American Physical Society, 2020.
-
Abstract
- Noise that exhibits significant temporal and spatial correlations across multiple qubits can be especially harmful to both fault-tolerant quantum computation and quantum-enhanced metrology. However, a complete spectral characterization of the noise environment of even a two-qubit system has not been reported thus far. We propose and experimentally demonstrate a protocol for two-qubit dephasing noise spectroscopy based on continuous-control modulation. By combining ideas from spin-locking relaxometry with a statistically motivated robust estimation approach, our protocol allows for the simultaneous reconstruction of all the single-qubit and two-qubit cross-correlation spectra, including access to their distinctive nonclassical features. Only single-qubit control manipulations and state-tomography measurements are employed, with no need for entangled-state preparation or readout of two-qubit observables. While our experimental demonstration uses two superconducting qubits coupled to a shared, colored engineered noise source, our methodology is portable to a variety of dephasing-dominated qubit architectures. By pushing quantum noise spectroscopy beyond the single-qubit setting, our work heralds the characterization of spatiotemporal correlations in both engineered and naturally occurring noise environments.
- Subjects :
- Physics
QC1-999
Computer software
QA76.75-76.765
Subjects
Details
- Language :
- English
- ISSN :
- 26913399
- Volume :
- 1
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- PRX Quantum
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.121f34d291a841749f29114f7c915878
- Document Type :
- article
- Full Text :
- https://doi.org/10.1103/PRXQuantum.1.010305